Matter.js, change body shape

Phaser 3
5

I use the Tile map editor to create my shapes, and when importing to phaser I use the shapes to create bodies using the matter.bodies.rectangle/circle/polygon methods.

Example for rectangle

let newBody =   matter.bodies.rectangle(
    x,
    y,
   width,
    height,
    {
        isStatic: false,
        isSensor: false
    }
);

matterGameObject.setExistingBody(newBody, true);

Do not know if there is a builtin way to use the json directly, but you can create a method that takes the json data you want to make the new body and assign it like shown in the example. Then a callback or other type of check to know when to use what body for what frame.